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Molybdenum Grade Stainless Steels

The generic term “Stainless Steel” covers a large group of iron-base alloys that contain chromium. The term “stainless” implies a resistance to staining or rusting in air. Stainless steels contain at least 10.5% chromium, which promotes formation of a thin, chromium-enriched surface oxide. Without this minimum amount of chromium, iron-base alloys or steels corrode in moist air, forming the familiar red rust.

While chromium content determines whether or not a steel is "stainless," molybdenum improves the corrosion resistance of all stainless steels. It has a particularly strong positive effect on pitting and crevice corrosion resistance in chloride-containing solutions.

Stainless steels are grouped in several different types defined by the steel's microstructure. Austenitic stainless steels account for almost 75% of all stainless steels used in the world; ferritic, about 25%; duplex (mixed austenite and ferrite), about 1%; and martensitic about 1%. Composition is the primary determinant of stainless steel microstructure.

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